Coating preparation method for precision casting

Dongguan Precision CastingThe main parameters of the company’s silica sol organic chemistry are: SIO2 content, relative density, Na2o content, pH, kinematic viscosity, colloidal solution object diameter, etc. The main parameters of this organic chemistry critically endanger the compressive strength of the shell and the reliability of the coating. And the powder-to-liquid ratio of the paint.

Because the precision casting company cannot test the main parameters of this organic chemistry, on the one hand, it is necessary to improve the selection, comment and determination of the supplier, on the other hand, the surface layer and the back layer should be selected and applied with different specifications and models. For silica sol, select S-830 silica sol for the surface layer and S-1430 silica sol for the back layer. The configuration of the coating will immediately endanger the quality of the casting during precision casting, so people should master the configuration of the coating first.

Generally, the coating configuration is to put silica sol first, add wetting agent and stir, add fireproof particles during the stirring, and finally add defoaming additives. In order to ensure the quality of the coating, when all the surface coatings are pellets, the stirring time should exceed 24h before they can be applied. If part of the new seasoning is new, the stirring time can be reduced to 12h. For the surface coatings, when all the coatings are newly prepared, the stirring time exceeds 10h, and when some are newly prepared, the stirring time can be reduced by half. If the selected paint has not been applied, it should be sealed and sealed to avoid water volatilization.

Try not to mix paint in the actual shell-making operation, but set up professional paint to configure machinery and equipment.